Patent GB-765857-A (GB)
Title: Improvements relating to suction cleaners
IPC: A47L9/14
Filed: 1955-01-04
Abstract: 765,857. Suction cleaners. HOOVER, Ltd. Jan. 4,1955 [Jan. 7, 1954; Jan. 7, 1954; May 7, 1954], No. 251/55. Classes 8(1) and 8(2) A suction cleaner comprises an expendible filter bag 28 that is closed except for an inlet opening in one generally flat wall 33, a mounting plate 35 having an opening 36 and secured to the flat wall 35 with the openings in register and a valve plate 39 having an opening 36<SP>1</SP> and which is carried by the mounting plate 35 so as to slide between an open position in which the opening 36<SP>1</SP> registers with those in the filter :and the mounting plate and a closed position in which it closes them. The mounting plate 35 is provided with slots 37, 38 and the valve plate 39 with lugs 40 which are threaded into the slots. 37 while the other end of the valve plate passes through the slot 38; the mounting plate is slotted :at 42 to expose the end of the valve plate 39 which is provided with a hole 41. The mounting plate 35 is secured to the face 33 by an annular area surrounding the opening 36 so that the edges of the mounting plate are free from the filter bag. In a modification the valve plate slides between two members forming the mounting plate which members are spaced apart by a spacing member which is provided with a shoulder which is engageable by lugs on the valve plate to limit the movement thereof. In Figs. 1, 3 the first embodiment is shown mounted in a cleaner housing 10 which is provided with guide channels 43, 45 into which the mounting plate 35 slides, the hole 41 being engaged by a hook 51. 'The sides of the plate 35 and the channels 43 may be convergent for location purposes. In addition the cleaner is provided with a filter ejection device which comprises a - rod 52 slidable in a bracket 46 and the end ring 19, and carrying a lever 55, loaded by ,a spring 53, engaging the end of the filter mounting plate, the channels 43, 45 being provided with suitable notches. The rod 52 is pushed inwardly by the engagement with the end thereof, of the end cover 20 so that the spring 53 is loaded. On opening the end cover 20 the spring 53 forces the lever 55 outwardly and the filter is partially ejected. Since the hook 51 engages the hole 41 in the valve plate the latter is moved relatively to the mounting plate and the opening 36 therein is closed. The suction inlet connection 58 is provided on its lower exterior surface with coarse threads which are engaged by similar threads on a member 65 secured to a sealing member 64; the member 65 has in addition a radial flange 66 engageable by a pin 67 carried on the rod 52 so that inward movement of the rod 52 partially rotates the member 65 which moves down on the threads causing the seal 64 to engage the top of the mounting plate 35; outward movement of the rod 52 causes the seal 64 to release the filter. The Specification describes a construction in which the second embodiment of filter is mounted on the end - cover of a cleaner and an arrangement in which the end cover is connected to two spring loaded rods which raise the end cover carrying the filter, clear of the housing. The end cover carries similar devices to those shown in Fig. 1 for releasing a suction inlet seal and for partially ejecting the filter bag from the end cover. In addition the Specification describes how the mounting plate may be fitted to a handle propelled type suction cleaner. Specification 765,858 is referred to.